mills



(No Mode1-) Y 2 Sheets-Sheet 2.

F, W. IVHLLS.v

AIR BRAKE No. 476,546. PBA-,medium 7; 1892. A

limiten rains FRANK YV. MlLLS, OF CHICAGO, ILLINOIS, ASSlGrN OR TO THE MlLLS lili PROVED PNEUMATIO BRAKE COMPANY, OF SAME PLACE.

MHHERM.

SPECIFICATION forming part of Letters Patent No. 476,546, dated June "i, 1892.

Application tiled August 8, 1891.

To all whom t may concern:

Be it known that l, FRANK W. MILLS, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a new and useful improvement'in Air-Brakes, of which the following is a specification. x

Hy invention relates to an improvement in air-brake mechanism for railwavcars, and is particularly directed to a means for supplying the reservoir with air for the purpose of operating the brakes.

The object ot my invention is to provide a desirable apparatus by which the supply ot air in the reservoir, generally iocated under the car, may be furnished automatically by .theoperation et the brakes in stopping; .and

my object is, furthermore, to improve the coustruction of the mechanism involved in tlre details of the device in the particulars and for the purposes hereinafter described.

lilly invention consists, primarily, in a connection between the brake and an interme diate pump, whereby the operation of the brake upon the Wheel shall serve to actuate the pump to supplyv air to tl1eai1reservoir.

My invention consists, further,in the combination, with the air-brake mechanism, ot a supplemental pump operated by an eccentric formed upon the axle of the car and released by the operationoi the air-brake mechanism to pump air into the air-reservoir.

My invention consists, further, in the general and specific details of mechanism and combinations ot parts hereinafter more fully set forth.

ln the accompanying drawings, Figure l is a view in sectional elevation of a car provided With my improved air-brakemechanism, and Fig. 2 is a sectional elevation showing the details 4ot" mechanism.

A rcpresesents the floor of the car; l5, the air-reservoir; C, the valved air-pipe leading lo the brake mechanism, and D the brakeopcrating lever and cord, all of common construction. Upon the axle of the car, at any convenient location and caused to revolve therewith, is the eccentric E. A lever F, pivoted at one end in the hanger F, carries at its opposite end the shoe F2, adapted to press upon the eccentric E. The connection besenn No, 402,102. on man.)

tween the shoe Fl and the leverl E is pivotal as shown. A spring F3 controls the operationA of the lever F in the manner hereinafter Set forth. i

Through an aperture G', formed in the iioor of the' car, entends vertically, to nieve freelyv7 therein, a pump-cylinder @,provided with the'external cup-shaped liango 2f. Surrounding the opening G, I prefer to provide 6o the flanged and annularly-recessed colla fi carrying in the annular recess friction balls o r rollers 152. The purpose ot this construction, as will readily be apparent, is to providea means for holding the cylinder in its vertical position while permittinga slight D play in the door of the car indeoendentbof the movement of the trucks. The piston ll within the cylinder G, connected throue'ii its rod Il With the arm or lever F, the con- 7o nection being made through the mediumof alpin passing through the lever, shoe and piston-rod, t'or the connection of Which hangers .sare provided to depend from thc cyclinder G. A pipe l affords,communication" between the reservoir B and the upper part of 75 the cylinder G, being provided at the latter point with an outgoing valve l. The invoing pipe l' leads fromthe top of the cylinder G, Where it is provided with an ingoinrfvalve 8c K', to a perforated collar Lfand at th iatter point it is provided with a valve M, the stem hl of which extends through the base of the collar and connects with a diaphragm of tierihle material N, supported in the annular 8' flange N", extending from the wall of the D reservoir B. Between the diaphragm and the collar the stem M is surrounded bv a spring Mathe normal tendcncyof which 'is to het;a the valve closed upon its Y, p

The operation ot the device is as follovvs- The reservoir B being filled with air, upon opening of the valve in the pipe C for the purpose of applying the brakes the pressure on the diaphraglnhi is Withdrawn, permit-tint" the valve M to be drawn from its seat byhthi 95 action of the spring il 2. At the same time the spring F3, assisting gravitv, causes the shoe F2 to rest upon the eccentric E and the revolution ot thc latter, in connection with roo the spring F, causing the raising and lowering ot the shoe, also cltccts the raising and lowering of the piston H, the latter movement sucking into the cylinder 'through the pipe K air admitted through the perforated collar L, and the former or upward movement serving to expel the air through the vpipe l into the cylinder B. Vhen the proper pressure has been obtained in the reservoir B, the valve M closes, and nomore air thus being admissible in the cylinder B a vacuum is formed which holds the piston,and hence theshoe Fin the raised position against the resilience of the spring F3, this position vbeing maintained until pressure is again drawn from the. reservoir B, when the operation above described is repeated.

WVhatl claim as new, and desire to secure by Letters Patent, is- K 1. In an air-brake` mechanism, in combination with the air-reservoir for the brakes,A

pumpv mechanism for pumping air into the reservoir, and means, substantially as described, actuated by the operation ot" the brake-applying mechanism for bringing the pump-piston into engagement with a part moving with the wheel, whereby the application of the brakes shall cause the pump to eject air into the reservoir to renew the supply therein, substantially as described.

2. In anair-brake mechanism, the combination, with the air-reservoir, of a pump actuated by the revolution of the car-axle, pipe I for conveying air from the pump to the reservoir, pipe K for admitting air into the pump and provided at its opposite end With'a valve, and a diaphragm connected with the valvestem and operated by the pressure in the reservoir, whereby the reduction of pressure in the reservoir shall open the valve to admit air to the pump-cylinder and the access of suicient pressure to the cylinder shall close the valve admitting air to the pump, substantially as described.

'3. In an air-brake mechanism, in combinar" tion with the reservoir B, the vertically-arranged pump G, havinga vertically-slidingy support on the-"'car-or, and means for operating the same, substantially asv described.

4.' In an air-brake mechanism, in combination, the reservoir B, the eccentric E, moving with the Wheel, the shoe F2, normally heldin engagement with the eccentric, an air-pump and its piston, and afconreection between the piston and shoe, pipes leading from the pnmpcylinder to the reservoir B and the open air, A respectively, and an automatic'valve inthe and for the purpose described. 'Y

FRANK W. MlLLS.

In presence of- J. N. HANsoN, M. J. FROST.

open-air pipe actuated by the pressure in thel. V 

